Puppet users - Oct 2014 - external facter for datacenter from ipaddress - new to puppet

facter --debug returns

Fact file /etc/puppetlabs/facter/facts.d/datacenter.rb was parsed but 
returned an empty data set


Any help appreciate


# cat /etc/puppetlabs/facter/facts.d/datacenter.rb


Facter.add("datacenter") do

  setcode do

    datacenter = "unknown"

    # Get current ip address from Facter's own database

    ipaddr = Facter.value(:ipaddress)

    ######################################## HOUSTON data center

    if ipaddr.match("^10.220.")

        datacenter = "HOUSTON"

    ######################################## AUSTIN data center

    elsif ipaddr.match("^10.221.")

        datacenter = "AUSTIN"

    end

    datacenter

  end

end

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